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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount of assets classified as other.

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The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) segment	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Accounting Policies [Abstract]
Number of business segments \| segment	1
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
General CECL reserve	$ (2,270,529)		$ (2,629,975)	$ (2,509,747)	$ (2,088,143)
Deferred financing costs	20,100		24,500
Other assets	74,640		60,988
Reclassification, Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Proceeds from sale of loans held-for-sale	500
Other assets	500
Reclassification, Other \| Other Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Proceeds from sale of loans held-for-sale	8,300
Other assets	$ 8,300
Adjustment due to Adoption of ASU
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
General CECL reserve		$ 30,900	$ 30,867